Alkylamine derivative

A compound of Formula (I) or a salt thereof:

• wherein R1 and R2, each independently, represent a hydrogen atom, or unsubstituted C1-6 alkyl;
• R3 represents a hydrogen atom;
• R4 and R5, each independently, represent a hydrogen atom, substituted or unsubstituted C1-6 alkyl;
• X represents CH2, an oxygen atom, NH, or a sulfur atom;
• Y represents C═O, SO, SO2, or C═S;
• R6 represents a hydrogen atom;
• G represents R7-substituted phenyl or R7-substituted pyridyl, where the R7-substituted phenyl or the R7-substituted pyridyl may further be substituted with one or two R8;
• R7 represents sulfo or carboxyl;
• R8 represents substituted or unsubstituted C1-6 alkyl, halogeno, hydroxy, substituted or unsubstituted C1-6 alkoxy, sulfo, or C1-3 alkylcarbonylamino, where they may be different when more than one R8 exist;
• Q represents a hydrogen atom, substituted or unsubstituted C1-6 alkyl, carboxyl, CONReRf, CONHNHRg, CORh, phenyl, or substituted or unsubstituted oxadiazolyl;
• Re and Rf, each independently, represent a hydrogen atom, substituted or unsubstituted C1-6 alkyl, substituted or unsubstituted C1-6 alkylsulfonyl, phenylsulfonyl, substituted or unsubstituted C3-8 cycloalkyl, or hydroxy, or alternatively, Re and Rf may integrally form morpholino;
• Rg represents substituted or unsubstituted C1-6 alkylcarbonyl;
• and
• Rh represents substituted or unsubstituted C1-6 alkoxy,
• provided that when X is methylene or an oxygen atom, Y is C═O, all of R1-R5 are hydrogen atoms, and G is R7-substituted phenyl optionally substituted with one or two R8, then, Q is a group other than carboxyl or CORh.